Bind the two ChoiceField controls in the code-behind with some sample values.
You can use the same approach by getting any content via the managers and bind the ChoiceField controls.
Following are the code blocks of the two methods:

privatevoidBindDropDownField()

{

this.DropDownField.Choices.Clear();

//adds a default value -Select-

this.DropDownField.Choices.Add(

newChoiceItem()

{

Text = string.Format("-{0}-", Res.Get<Labels>().Select),

Value = Guid.Empty.ToString()

});

this.DropDownField.AddDefaultChoices();

}

privatevoidBindCheckBoxesField()

{

this.CheckBoxesField.AddDefaultChoices();

}

You can implement an Extension method to bind the ChoiceField. This tutorial uses the AddDefaultChoices extension method in the following way: